Abstract:
Célula solar de banda intermedia con puntos cuánticos no tensionados El invento se refiere a una célula solar de banda intermedia cuyo material de banda intermedia (3) consiste en una colección de puntos cuánticos (12) de un material semiconductor A inmersos en un volumen (13) de otro semiconductor B. El material A se caracteriza por tener una estructura cristalina del tipo sal de roca, mientras que el material B tiene una estructura zinc blenda. Los puntos cuánticos (12) se producen por la inmiscibilidad del material A en el material B. Por lo tanto, es posible elegir una combinación de materiales A y B con una constante de red muy similar, de modo que la capa (3) de material de banda intermedia no presenta acumulación de tensión mecánica.
Abstract:
A Kesterite film is vacuum deposited and annealed on a substrate. Deposition is conducted at low temperature to provide good composition control and efficient use of metals. Annealing is conducted at a high temperature for a short period of time. Thermal evaporation, E-beam evaporation or sputtering in a high vacuum environment may be employed as part of a deposition process.
Abstract:
The invention is a method of forming a cadmium sulfide based buffer on a copper chalcogenide based absorber in making a photovoltaic cell. The buffer is sputtered at relatively high pressures. The resulting cell has good efficiency and according to one embodiment is characterized by a narrow interface between the absorber and buffer layers. The buffer is further characterized according to a second embodiment by a relatively high oxygen content.
Abstract:
The present invention provides methods to sputter deposit films comprising alkali metal compounds. At least one target comprising one or more alkali metal compounds and at least one metallic component is sputtered to form one or more corresponding sputtered films. The at least one target has an atomic ratio of the alkali metal compound to the at least one metallic component in the range from 15:85 to 85:15. The sputtered film(s) incorporating such alkali metal compounds are incorporated into a precursor structure also comprising one or more chalcogenide precursor films. The precursor structure is heated in the presence of at least one chalcogen to form a chalcogenide semiconductor. The resultant chalcogenide semiconductor comprises up to 2 atomic percent of alkali metal content, wherein at least a major portion of the alkali metal content of the resultant chalcogenide semiconductor is derived from the sputtered film(s) incorporating the alkali metal compound(s). The chalcogenide semiconductors are useful in microelectronic devices, including solar cells.
Abstract:
A quantum well device includes a first layer of a first two-dimensional material, a second layer of a second two-dimensional material, and a third layer of a third two-dimensional material disposed between the first layer and second layer. The first layer, the second layer, and the third layer are adhered predominantly by van der Waals force.
Abstract:
A technique includes fabricating a layered precursor including: depositing a first film including a first indium gallium selenide compound on a substrate; then depositing a second film including a CuSe compound; then heating the substrate, the first film and the second film to convert the CuSe compound in the second film to a Cu 2-x Se (0.2=
Abstract:
The present invention relates to a method for manufacturing semiconductor thin films. In particular, it relates to the manufacturing of (Ag x Cu 1-x ) 2 ZnZ (S y Se 1-y ) 4 thin films, wherein x and y can be selected between 0 and 1 and wherein Z can be selected from Sn, Ge, Si, Pb. The method avoids the loss of Z during annealing, resulting in semiconductor material of a high quality.